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The size for a non-regular file is already set to zero but
at the wrong place. It is currently done in the add() method
and not in gettarinfo() as it should be. Since you use the
addfile() and gettarinfo() methods in your test script, you
get unwanted results.

I submitted patch #1168594 that fixes the whole problem in a
more generic way and is closely related to the fix for bug
#1031148 from last year.